Dogs suddenly pee on the bed what does it mean Dogs suddenly pee on my bed

The dog suddenly peed on the bed what means 1, the dog is in heat, through the urine to mark their territory, swear their sovereignty. The best way to do this is to take the dog neutered. 2, the dog and the owner of the conflict between the dog, the dog harbor a grudge, in the bed pee gas master. 3, the dog suffered from urinary tract disease, because of the pain and suffering of the disease and pee everywhere. 4, the last time the dog peed on the bed, the sheets are not clean, the residual odor let the dog smell, continue to pee here. The owner must use disinfectant to thoroughly remove the smell. 5, the dog was not educated when it was small and did not develop good bowel habits.